A 2D covalent organic framework with ultra-large interlayer distance as high-rate anode material for lithium-ion batteries  

作　　者：Manman Wu Yang Zhao Hongtao Zhang Jie Zhu Yanfeng Ma Chenxi Li Yamin Zhang Yongsheng Chen 

机构地区：[1]The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials,Institute of Polymer Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China [2]State Key Laboratory of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China [3]Renewable Energy Conversion and Storage Center(RECAST),Nankai University,Tianjin 300071,China [4]State Key Laboratory of Applied Organic Chemistry,College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China

出　　处：《Nano Research》2022年第11期9779-9784,共6页纳米研究（英文版）

基　　金：the financial support from Ministry of Science and Technology of China(No.52090034);the National Natural Science Foundation of China(No.51633002);Higher Education Discipline Innovation Project(No.B12015).

摘　　要：Covalent organic frameworks(COFs)have been broadly investigated for energy storage systems.However,many COF-based anode materials suffer from low utilization of redox-active sites and sluggish ions/electrons transport caused by their densely stacked layers.Thus,it is still a great challenge to obtain COF-based anode materials with fast ions/electrons transport and thus superior rate performance.Herein,a redox-active piperazine-terephthalaldehyde(PA-TA)COF with ultra-large interlayer distance is designed and synthesized for high-rate anode material,which contains piperazine units adopting a chair-shaped conformation with the nonplanar linkages of a tetrahedral configuration.This unique structure renders PA-TA COF an ultra-large interlayer distance of 6.2Å,and further enables it to achieve outstanding rate and cycling performance.With a high specific capacity of 543 mAh·g^(−1) even after 400 cycles at 1.0 A·g^(−1),it still could afford a specific capacity of 207 mAh·g^(−1) even at a high current density of 5.0 A·g^(−1).Our study indicates that expanding the interlayer distance of COFs by rational molecular design would be of great importance to develop high-rate electrode materials for lithium-ion batteries.

关 键 词：lithium-ion batteries high-rate anode material covalent organic frameworks ultra-large interlayer distance 

分 类 号：TM912[电气工程—电力电子与电力传动]